WO2000058649A1

WO2000058649A1 - Leaf spring valve

Info

Publication number: WO2000058649A1
Application number: PCT/JP2000/002008
Authority: WO
Inventors: Kazuhiro Aoki
Original assignee: Kitz Corporation
Priority date: 1999-03-31
Filing date: 2000-03-30
Publication date: 2000-10-05
Also published as: US6557827B1; CN1345404A; CN1217117C; EP1182388A4; JP4509391B2; EP1182388B1; EP1182388A1

Abstract

A leaf spring valve which is capable of being opened and closed assuredly and stably with a small operating torque by having a stored springing force in a valve disc itself, reducing a cost, and being manufactured compact, and being excellent in durability and high in practical use value, and which further provides a constant flow function to the valve disc itself having a sealing function for multi-functionability, provides various types of constant flow functions according to the number of rotations of the spring, and can controllably open and close a flow path for fluid, wherein one end of a main spring (47) is installed inside a valve chamber (42) of a valve box (41), the other end is installed on a valve stem (52) in the valve chamber (42), the side face of the main spring (47) is disposed opposedly to and pressingly against a valve seat (42a) of the valve box (41), and the valve stem (52) is rotated by an actuator (55) to displace the main spring (47) toward the center of the valve stem (52), whereby the side face of the main spring (47) is moved apart from the valve seat (42a) to open a secondary side flow path port (44).

Description

Description Leaf spring valve Technical field

The present invention relates to a relief spring valve having a valve body as a valve that opens and closes or adjusts a flow path and has a constant flow rate valve function, and more specifically, the valve body itself has an accumulating force. The present invention relates to an air conditioner that incorporates a drive valve body, controls the drive of the valve body with this accumulating force, and further has a constant flow rate valve function by itself, and an air conditioner that uses the leaf spring valve. Background art

Typically, a typical valve for opening and closing the flow path includes a ball valve that opens and closes the flow path by rotating a ball valve body having a through hole provided in the body. A valve such as a gate valve that opens and closes a flow path by operating a valve body that has been moved up and down in a body is known.

An electric valve is an example of an automatic valve. This electric valve has a valve structure in which a rotary valve such as a ball valve is opened and closed or a flow path is adjusted by an electric motor. A spring-return type electric valve that operates and closes using the unwinding force of a spring wound tightly in conjunction with the opening operation of the motor has also been implemented.

Further, as another special valve structure, a relief valve having a structure in which the opening of a cylindrical valve is opened and closed by a helical valve body formed of a shape memory alloy has been proposed (Japanese Patent Application Laid-Open No. H10-100). — See Japanese Patent Publication No. 304024).

On the other hand, a constant flow valve is a valve that controls the set flow rate. Normally, a constant flow cartridge selected according to the set flow rate is installed in the body. ing.

However, various valve structures proposed and implemented so far have the following problems.

First, the ball valve, which is a general valve, has a structure in which the ball valve body is turned while sliding while applying an appropriate amount of compressive force to an annular ball sheet. In addition, the shape of parts tends to be large in order to maintain strength, and the valve body and the ball sheet open and close while sliding. When the ball seat is in the open position, the ball seat may jump out into the flow path due to the action of the fluid pressure.Therefore, the ball seat requires maintenance and replacement of the ball seat during the specified use period, and the Has issues.

Also, the spring return type electric ball valve needs to be slidably opened and closed by a ball valve element, and requires a spring for charging the return operation of the valve separately from the valve element. The large torque required for the turning operation increased the size of the product and increased the cost (see symbols C, D, and E in the graph in Fig. 22).

Further, since the relief valve in the above-mentioned Japanese Patent Application Laid-Open No. H10-34020 is formed of a shape memory alloy material, it has a structure that opens and closes only when a fluid having a predetermined high temperature or higher is supplied. Because it is a valve, it is used for special fluids.In addition, the shape memory alloy material has a low yield and is an expensive material, which not only increases the cost but also lowers the reliability of the opening and closing operation. It was of low practical value.

In addition, a general constant flow valve can support only the set flow rate, and when changing the set flow rate, the built-in constant flow cartridge is replaced with the corresponding cartridge and used. Needed work.

The present invention has been developed in view of the problems with various conventional valve shapes. The purpose of the valve is to make it possible to open and close the valve with a small operating torque by using the valve element itself that has an accumulating force, and to enable reliable and stable opening and closing. To provide a valve with high practical value that is compact, can be manufactured compactly, and has excellent durability.In addition, the valve body that has a water stop function has a constant flow rate function and is multi-functional. the aim, the disclosure of _c invention lies in that to have a variety of constant flow rate setting function of the rotation speed of the valve shaft

The present invention relates to a valve for opening and closing a fluid flow path, wherein a valve body made of a curved leaf spring is housed in a valve body, and one end of a leaf spring is locked or fixed to the valve body side, The other end is locked or fixed to the valve shaft, and the curved surface of the leaf spring is arranged so as to be able to freely contact and separate from the flow path port with the curved end surface. This is a leaf spring valve that is displaced to the side to open the flow passage b.

In this case, the leaf spring is a wound mainspring, and the outer periphery of the mainspring is opposed to the flow path port.

The leaf spring valve according to the present invention is provided with a driving valve element for opening and closing or controlling a flow path in a valve box. The driving valve element has an accumulating force. Is a valve with a built-in drive valve body that is driven and controlled.

In this case, the accumulating force of the driving valve element is accumulated in the driving valve element itself by the output of the actuator which is an external driving force, and the accumulating force is substantially equal to the driving control force of the valve element itself.

The driving valve element is a mainspring, one end of the mainspring is mounted in the valve chamber of the valve box, the other end is mounted on the valve shaft in the valve chamber, and the side of the mainspring is pressed and arranged facing the valve seat of the valve box. With the actuator or manually by the valve shaft By rotating the mainspring toward the valve shaft side, the side of the mainspring is separated from the valve seat to open the secondary flow passage b. It is arranged near the primary side flow path b.

Further, a seal member formed of an elastic member such as rubber is integrally provided at a valve seat seal position of the mainspring.

Further, the mainspring itself is provided with a constant flow rate function by appropriately centripetally displacing the above-mentioned mainspring toward the valve shaft with a valve shaft rotated by an actuator or manually. In this case, an arbitrary constant flow is set according to the number of rotations of the valve shaft.

It is particularly preferable to use the leaf spring valve in an air conditioner that has a function to open, close, control or control a fluid in a pipe. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal sectional view showing an example in which an electric motor is mounted on a leaf spring valve according to the present invention.

FIG. 2 is an enlarged plan view in which a bonnet is removed from FIG. 1 and a part is cut away.

FIG. 3 is an enlarged front view showing the mainspring housed in the valve body of FIG.

FIG. 4 is a longitudinal sectional view of the valve main body shown in FIG.

FIG. 5 is an enlarged front view of the tubular seat housed in the valve chamber of FIG. FIG. 6 is a longitudinal sectional view of FIG.

FIG. 7 is a partially cutaway plan view of FIG.

FIG. 8 is a conceptual explanatory view showing an example of an open state of the reef spring according to the present invention.

FIG. 9 is a conceptual explanatory view showing the closed state of FIG. FIG. 10 is a conceptual explanatory view showing another example of the open state of the reef spring in the present invention.

FIG. 11 is a conceptual explanatory view showing the closed state of FIG.

FIG. 12 is a partial cross-sectional view of a hook mechanism showing an example in which the leaf spring valve of the present invention is applied to a manual valve.

FIG. 13 is a plan sectional view showing the locked state of FIG.

FIG. 14 is a longitudinal sectional view showing an example of a leaf spring valve incorporating a drive valve body according to the present invention.

FIG. 15 is an enlarged cross-sectional view of FIG.

FIG. 16 is a partially cut-away development view in which the drive valve body of FIG. 14 is developed. FIG. 17 is a sectional view taken along line AA of FIG.

FIG. 18 is a cross-sectional view taken along the line BB of FIG.

FIG. 19 is a conceptual explanatory diagram of FIG.

FIG. 20 is a partially enlarged view showing an initial movement state in which the drive valve body in FIG. 14 is separated.

FIG. 21 is a partially enlarged view showing a state where the drive valve body of FIG. 20 is separated.

FIG. 22 is a graph in comparison with the conventional example.

FIG. 23 is a perspective view showing a method of inserting the mainspring into the valve stem in FIG.

FIG. 24 is a partially cutaway side view of the valve shown in FIG. FIG. 25 is an explanatory view of an air conditioner using a relief spring valve of the present invention for a fan coil unit.

FIG. 26 is a cross-sectional view showing a state where the leaf spring valve has a function as a constant flow valve.

Fig. 27 shows the case where the rotation speed of the valve shaft is changed in the valve of Fig. 26. 5 is a graph showing the relationship between the differential pressure and the flow rate. BEST MODE FOR CARRYING OUT THE INVENTION

Various embodiments in which a leaf spring, which is an example of the present invention, is applied to a mainspring will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an example in which a mainspring is mounted on a valve shaft that is rotated by driving an electric motor.

In the figure, a cylindrical valve chamber 2 is formed inside a valve body 1 having piping connections la and 1b, and the valve chamber 2 has a primary side flow path 3 and a secondary side flow path 4 Are formed by bending the end surfaces thereof, and annular grooves 5 and 6 are provided in the upper and lower portions of the flow paths 3 and 4, respectively.

5 to 7, reference numeral 7 denotes a cylindrical sheet made of rubber or the like. The cylindrical sheet 7 is provided with annular engaging projections 8 and 9 at the upper and lower ends thereof. Circular openings 10 and 11 are formed on the left and right of 7, and an annular positioning portion 12 is provided on the outer peripheral side of the secondary opening 11 and on the inner peripheral side of this portion. A thick-walled valve seat 13 is provided at the opening position.

When the cylindrical sheet 7 is mounted in the valve chamber 2, the engaging projections 8, 9 of the cylindrical sheet 7 are engaged with the annular grooves 5, 6 in the valve chamber 2, and The annular positioning portion 12 formed is fitted into the valve chamber 2 in a state where the cylindrical sheet 7 is prevented from rotating by being fitted to the inner peripheral surface of the flow path 4.

In FIG. 3, reference numeral 14 denotes a spring (valve element) formed of a corrosion-resistant metal such as stainless steel. The spring 14 has an outer end extending vertically and having a U-shaped or circular shape. Engaging portions 15 and 16 provided outward in the shape and rectangular inwardly bent pieces 17 are provided at the inner end, and fitting grooves 18 and 19 provided above and below the valve chamber 2 are provided. The fittings 15 and 16 are fitted to the fittings, while the bent pieces 17 are fitted to the slits 21 formed on the valve shaft 20 and the spring 14 is mounted in the valve chamber 2 At the same time, the mainspring 14 and the valve shaft 20 are linked. In this case, the spring 14 is stored in the valve chamber 2 in a state of having an accumulating force.

As shown in FIGS. 8 and 9, a plurality of the fitting grooves 18 and 19 are provided in the valve chamber 2 and the mounting position of the outer end of the mainspring 14 is appropriately selected. It is preferable that the mainspring 14 can be set at a position where the flow passage b can be reliably opened and closed.

In FIG. 1, a disc-shaped spring holder 33 is fitted into a stepped portion 20 a of a valve shaft 20 which is inserted into the valve body 1 while supporting the spring up and down to prevent the spring 14 from moving up and down. A bonnet 22 is screwed and fixed to the upper end of the valve body 1, and a unidirectional or bidirectional rotating actuator 23 is fixed to the upper end of the bonnet 22.

The fixing means in this example is that the connecting member 23 a provided at the lower part of the actuator 23 is fastened and fixed with the packing nut 25 via the ring 24, but is not limited to this. Various fixing means are appropriately selected and implemented.

Although not shown in the present example, the actuator 23 transmits the driving force of the electric motor to the output shaft via a gear mechanism, and transmits the driving force of the output shaft to the valve shaft 20 to transmit the driving force to the valve shaft 20. Is rotatably provided. The bent piece 17 of the spring 14 is fitted into the slit 21 of the valve shaft 20, and the engagement part 15 of the spring 14 is fitted into the fitting grooves 18, 19 of the valve chamber 2. , 16 are fitted and the valve shaft 2 ◦ and the spring 14 are interlocked, and the spring 14 is wound around by the rotation of the valve shaft 20 by the actuator 23 to displace the spring 14 toward the center of the valve chamber 2. It is set up so that channels 3 and 4 are opened.

On the other hand, in the case of electric motor, when the power is cut off, the curved surface 14a of the spring 14 comes into contact with the flow passages 3 and 4 by the pressing force accompanying the release of the spring 14, and the curved surface 1 4a is applied to the valve seat 13 of the cylindrical sheet 7 by the pressure of fluid pressure The channel B 4 is closed by hermetically contacting and sealing.

Since the valve function is to open and close the flow path 4, the curved surface 14 a of the mainspring 14 does not necessarily need to contact the flow path 3.

The above example shows an example of a spring return type electric valve that opens and closes with the driving force of the actuator 23.However, the present invention is not limited to this, and even in the case of manual operation, the handle or valve shaft is placed at an appropriate position. If the locked lock mechanism is removed, it is rewound by the force of the mainspring, closing the flow path and automatically closing it.

In the case of manual operation, a handle 26 is provided at the upper end of the valve shaft 20 and a plurality of engagement grooves provided at the upper end of the valve body 1 as shown in an example of FIGS. A lock pin 29 is provided on 2 7 via a spring 28 so that it can be pressed and fitted.Turn the handle 26 while pressing the lock pin 29, and release the lock pin 29 at the stopped position.弹 The spring is locked to the engagement groove 27 by the spring force. The spring 14 in the open state can also be locked by locking it at an appropriate position. — In the case of closing, if the lock is released, The spring's rewinding force causes the curved surface of the spring to close the flow path b and automatically close. The plurality of engagement grooves 27 are provided at arbitrary positions to be locked.

As another example of manual operation, in the case of manual operation in which manual operation is possible by pressing the valve shaft with the handle, the mainspring is displaced toward the center of the valve chamber by the turning operation of the handle, and the flow path port opens. When the handle is released, the locking member is locked by the spring force of the spring, and the open mainspring 14 is fixed at an appropriate position. By adopting a structure in which the handle is rotated by the clutch mechanism and fixed at an appropriate position, the reef spring valve of the present invention can be applied to a manual valve.

Next, the operation of the above embodiment will be described with reference to the conceptual explanatory diagrams in FIGS. 8 and 9. First, in FIG. When the motor 23 is not driven, or when the handle is set to the closed position with the manual valve, the spring return force of the spring 14 causes the spring outer peripheral surface 14 a that is the outer peripheral surface of the spring 14 to return. It is crimped to the valve seat 13 and the flow path 4 is closed by the spring 14. -In this case, the curved surface 14a presses the valve seat 13 against the inside of the valve body 1, so that the valve seat 13 is securely closed.

Next, when the terminal 23 or the handle is driven in the counterclockwise direction to rotate the valve shaft 20 and wind the mainspring 14, the curved surface 1 of the mainspring 14 is turned on as shown in FIG. 4a leaves the valve seat portion 13 and the flow passage port 4 is opened.

In this state, if power is cut off and the handle is removed, the spring 14 is released and the valve shaft 20 and the curved surface 14a return to the state shown in FIG.

In this case, the mainspring 14 and the valve seat 13 are not slid in the circumferential direction like a rotary valve such as a ball valve, but are separated in a non-sliding type contact state, so that wear occurs. The durability is extremely good without any problem, and when the valve body is zener, the tightening torque can be small and the operability is good. Further, in the case of this example, the winding direction of the mainspring 14 is counterclockwise as shown in FIG. 8 so as to match the opening and closing direction of the normal valve. .

FIG. 10 and FIG. 11 are conceptual explanatory views showing other examples of leaf springs. The outer end 30 a of the leaf-shaped spring (valve element) 30 is fitted to the fitting groove of the valve body 1. When the inner end 30b is fitted through the slit 32a of the valve shaft 32 and attached, and the valve shaft 32 is automatically or manually rotated, the shape shown in Fig. 10 is obtained. _t the flow path b 4 is opened, split ring 3 0 unwind force split in g 3 0 curved surface 3 4 the valve seat portion 1 3 crimped to ensure the passage b 4 at the is closed as shown Other examples of the relief spring valve of the present invention will be described. Without providing the above-mentioned cylindrical sheet 7 in the valve chamber 2 of the valve body 1, rubber is baked or glued to the outer peripheral position of the curved surface 14a facing the flow path 4 of the leaf spring such as a mainspring. A configuration may be adopted in which a sheet (not shown) is fixed, and the sheet is opened and closed by contacting and separating the sheet and the flow path port of the valve chamber. In this case, the shape of the valve chamber can be made simpler, and the engaging portion of the leaf spring with the valve chamber is not divided and protruded as indicated by reference numerals 15 and 16 in FIG. It can be provided over the entire width of the spring or at any suitable location.

As means for attaching the outer end and the inner end of the mainspring 14, in addition to the above example, a shaft is fixedly implanted or supported in the valve body 1, and the outer end of the mainspring is engaged with this shaft. An outward pin may be provided on the valve stem, and a hole formed in the inner end of the mainspring may be engaged with this pin, and these are optional depending on the implementation.

Next, an embodiment of a leaf spring valve incorporating a drive valve body will be described in detail with reference to FIGS. 14 to 24.

The embodiment in this example has substantially the same configuration and operation and effects as those of the embodiment described in FIGS. 1 to 13, and thus will be described in detail focusing on particularly different parts.

FIG. 14 is a longitudinal sectional view showing an example of a valve having a valve shaft that is rotated by the driving force of an electric motor and a driving valve element that is a mainspring.

In FIGS. 14, 15 and 24, reference numeral 41 denotes a valve box having pipe connection portions 41 a and 41 b. A valve chamber 4 2 having a peripheral surface, a primary side flow path 43 and a secondary side flow path 44 are provided in the valve chamber 42, and O is provided at a lower portion of the valve box 41. The cap 45 is covered with the set screw 45 a via the ring 46.

That is, as described later, the mainspring 47 is inserted from below the valve box 41, and the valve box and the bonnet are integrated. During _t view Da Chief of parts is also the sealing property good structure compact Bok was unnecessary, 4 7 is a driving valve body provided for opening and closing or control the passage in the valve box 4 in 1 The driving valve element 47 has an accumulating force in the valve element itself, and the valve element itself is driven by the accumulating force to close the valve port.

The accumulating force of the drive valve element 47 is substantially non-slidable by the output of an actuator 55 incorporating a motor M, which is an external drive force provided in the valve box 41, or by manual operation. It is stored in itself, and the stored power is configured to be substantially equal to the drive control force of the drive valve body 47.

As shown in FIGS. 15 to 19, the drive valve element 47 in this example uses a spiral spring 47, which is formed of a corrosion-resistant metal such as stainless steel. At the outer end of the mainspring 47, an engaging portion 48 is provided outwardly in a shape such as a U-shaped cross section or a circular shape, and at the inner end, a bent piece 50a is provided with a locking portion at its tip. 50 b is provided. As shown in FIGS. 15 and 19, the engaging portion 48 is preferably engaged with a fixed (engaged) position 54 provided near the primary side flow path 43. preferable.

The reason for this is as follows. The curvature of the mainspring 47 is stable on the opposite side of the engagement groove 54 of the valve box 41 with the center of the mainspring 47 as the axis of symmetry. This is for the purpose of improving the sealing performance with the valve seat 56 by arranging the valve seat 56 so as to face it.

Further, as shown in FIG. 15, the engagement groove 54 is located at a position where the side of the mainspring 47 connected to the engagement portion 48 blocks the primary side flow passage 43 when the valve is closed. Because of the provision, when the valve is opened, the fluid can smoothly flow to the secondary flow path B 44 without being wound around the spiral portion of the mainspring 47.

FIG. 23 shows another embodiment for assembling the mainspring 47. In FIG. 23, the mainspring 47 is restrained by a restraining member 58 such as a ring and a case in a state where the diameter of the mainspring 47 is reduced from the inner diameter of the valve chamber 42, and this is held under the valve box 41. And the engaging part 48 is engaged with the engaging groove 54, and the bent piece 50a and the locking part 50b are fitted with the slit 52b of the valve shaft 52. The mainspring 47, which has been inserted into the groove 52a and then released the restraining member 58, has been reduced in diameter. The spring is closed by being pressed by 6, and is thus housed in the valve chamber 42 with the energy of the mainspring 47. The mainspring 47 has a thickness and rigidity that are not less than a predetermined value and does not vibrate under the influence of the fluid energy flowing in the valve, and is about 0.2 mm in the present example.

Further, a valve seat 56 is provided in the flow passage B 44 on the secondary side of the valve chamber 42, and a seal member 49 pressed against the sealing position of the valve seat 56 is provided with a valve seat seal of the mainspring 47. It is provided integrally at position 47a. Specifically, as shown in FIGS. 16 to 18, the sealing member 49 is formed of an elastic member such as rubber, and is integrally fixed to the mainspring 47 by baking. The reference numeral 49 denotes an annular elliptical and protruding portion, which increases the surface pressure of the valve seat seal to ensure reliable sealing. Further, a projection 49a is provided at an annular symmetrical position of the sealing member 49 so that when the mainspring 47 is separated from the valve seat 56, the projection 49a can be easily formed from the projection 49a of the sealing member 49. The mainspring 47 is surely separated from the surface of the valve seat 56 by peeling.

Further, the sealing member 49 is formed to have a thickness capable of absorbing a slight change in curvature of the mainspring 47 and ensuring a predetermined valve seat sealing performance. In FIGS. 20 and 21, when the mainspring 47 is operated in the opening direction, the seal point of the valve body 47 is placed in the circumferential direction similarly to the ball of a general ball valve. Acts, but in addition, a force F _{2 in} the centripetal direction of the valve element 47 also acts, so at the initial movement of the valve opening, this seal point moves in the circumferential direction while being separated from the valve seat 56. As a result, almost no sliding resistance occurs. Therefore, as is clear from the comparison table with the conventional spring return valve as shown in FIG. 22, the motor M in the actuator 55 can be reduced in size.

That is, in the figure, the conventional valve torque E and the conventional spring torque D are combined to require the conventional actuator torque C. On the other hand, since only the mainspring torque B of the present example is sufficient, the present example requires only the actuator torque A, thereby enabling downsizing and cost reduction of the actuator.

Reference numeral 53 shown in FIGS. 15 and 19 denotes a penetration hole formed in the valve shaft 52, into which the inner end portion of the spring 47 is inserted. It is fixed to 2.

Next, the operation in this example is substantially the same as in the first embodiment. When the mainspring 47, which is a driving valve element, is wound from the output of the actuator 55 through the transmission member 55a, the mainspring 47 is charged almost without sliding and is fixed to the mainspring 47. The seal member 49 separates from the valve seat 56 to open the secondary side flow path 44 to be in an open state. In this case, the energy stored in the spring 47 becomes the driving control force of the spring 47 itself. Is approximately equal to

Next, when the winding state of the mainspring 47 is released manually or automatically, the sealing member 49 is pressed against the valve seat 56 by the energy stored in the mainspring 47, and the secondary side flow path 44 is closed. Close securely.

Also, as shown in Fig. 26, the spring 47 is moved to the valve shaft 52 side by the centrifugal force with the actuator 55 or the valve shaft 52 rotated manually, thereby fixing the spring 47 itself. The flow rate function can be exhibited, and in this case, an arbitrary constant flow rate can be set by the rotation speed of the valve shaft 52.

Fig. 27 shows the case where the primary pressure is fixed and the rotation speed of the valve shaft 52 is changed. The relationship between the differential pressure and the flow rate is shown in the graph. In this case, the nominal size of the leaf spring valve is 1B.

As a result, when the valve shaft 52 is fixed with 6 rotations, the flow rates are almost constant at 54.2, 52.8, and 53.2 LJmin, respectively, even if the differential pressure is different. I have. This tendency is the same even when the valve shaft 52 is rotated 5.5, 5.0, and 4.5 times, and even when the differential pressure fluctuates, the fluctuation of the flow rate is within a maximum of 0%. Was.

Next, an example in which the leaf spring valve or the valve with a built-in drive valve body (hereinafter referred to as a valve 60 or the like) of the present invention is used in an air conditioner such as a fancoin repellent air handling unit will be described. In this case, the leaf spring valve has both a water stop function and a constant flow rate function.

FIG. 25 shows an example in which the above-described valves 60 and the like are used for the fan coil unit 61. The fan coil unit 61 is a device that adjusts the room temperature in a certain space by flowing cold water or hot water inside the coil 62 and blowing air onto the surface of the coil 62 using a fan 63.

In the figure, an example is shown in which the valve 60 is provided in the out-side piping 65 of the cooling and heating water device 64, but the invention is not limited to this, and it may be provided in the in-side piping 66.

The valve or the like 60 of the present invention has an operating characteristic that it reaches the fully open state over a relatively long time when the valve is opened, and reaches the fully closed state in a short time when the valve is closed. Therefore, it is most suitable for applications where it is not necessary to suddenly reach the fully open state, such as the fan coil unit 61.

Further, as described above, the valve 60 etc. of the present invention is compact and can be reduced in cost, and is excellent in economical efficiency. Therefore, the valve 60 is not used like an individual air conditioner such as a fan coil unit. Particularly suitable for applications requiring a large number of valves. In this example, a fan coil is taken as an example of the air conditioner. However, the valve or the like 60 of the present invention is not limited to this, and is also suitable for a device such as an air handling unit.

Furthermore, the valve 60 etc. of the present invention can be used for various devices without being limited to the use of the air conditioner. Specifically, it can be applied to an emergency shut-off valve such as a gas shut-off valve by utilizing the operation characteristic of reaching a fully closed state in a short time. As the applicable fluid, a fluid having a low differential pressure, for example, cold / hot water or gas having a differential pressure of about 0.2 to 0.3 MPa (2 to 3 KgfZcm ² ) is suitable. Industrial applicability

As is clear from the above, since the valve is closed by the restoring force of the leaf spring, the valve is securely closed and stable operation is performed. The spring returns with a return force, so it can be operated with a spring return and a light operating force. Also, since the valve is opened only by tightening the spring tightening force, the torque is small and good. In addition, the spring return structure allows the valve body and the return spring to be used together, thus providing a compact, cost-effective valve with excellent economy.

Furthermore, since the spring such as a mainspring and the valve seat can be opened and closed without sliding, without sliding, the valve has high wear resistance, high durability and high practical value. Can be provided.

In addition, the valve seat is non-sliding during the intermediate operation, so the valve seat wear is small, and further, there is no fluctuation of the operating torque due to the fluid pressure, and the peeling action against the sticking phenomenon of the valve seat is achieved. Yes, there is no possibility that the operating torque will increase, the operating torque is low due to the spring characteristics of the mainspring, and the actuator and valve can be miniaturized without the need for excessive precision. Can be

The leaf spring valve of the present invention has a function as a constant flow valve, and the flow rate can be arbitrarily set within a predetermined range by the rotation speed of the valve shaft. That is, unlike the conventional constant flow valve, there is no need to incorporate a dedicated constant flow device corresponding to the target flow rate, and it is possible to set the flow rate corresponding to the predetermined flow rate by changing the rotation speed of the valve shaft .

Further, the leaf spring valve of the present invention is particularly suitable for an air conditioner such as a fan coil unit or an air hand-held unit.

Claims

The scope of the claims

1. In the valve that opens and closes the fluid flow path, a valve body consisting of a curved reef spring is housed in the valve body, and one end of the leaf spring is locked or fixed to the valve body side, and the other end is The leaf spring is positioned so that the curved surface of the leaf spring can freely contact and separate from the flow path port with the curved end surface, and the leaf spring is rotated by the rotation of the valve shaft to the center side of the valve chamber. The leaf spring valve is characterized in that it is displaced to open the flow passage b.

2. The leaf spring valve according to claim 1, wherein the leaf spring is a wound mainspring, and an outer periphery of the mainspring is opposed to the flow path b.

3. A drive valve element for opening / closing or controlling the flow path is provided in the valve box. The drive valve element has an accumulating force, and the valve element itself is driven and controlled by the accumulating force. Leaf spring valve is a valve with a built-in drive valve body.

4. The accumulating force of the driving valve element is stored in the driving valve element itself by the output of an actuator or a manual operation which is an external driving force, and this accumulating force is substantially equivalent to the driving control force of the valve element itself. 4. The relief spring valve according to claim 3, wherein the valve is equal.

5. The leaf spring valve according to claim 3, wherein the drive valve body is a spring.

6. Attach one end of the mainspring according to claim 5 in the valve chamber of the valve box, mount the other end to the valve shaft in the valve chamber, and press and position the side of the mainspring facing the valve seat of the valve box. A leaf spring valve in which the main shaft is rotated by the above-mentioned actuator to displace the mainspring toward the valve shaft, so that the side surface of the mainspring is separated from the valve seat to open the secondary flow passage b.

7. The leaf spring valve according to claim 6, wherein an attachment position of the mainspring in the valve chamber is set near the primary side flow passage b.

8. The leaf spring valve according to any one of claims 3 to 7, wherein a seal member formed of an elastic member such as rubber is integrally provided at a valve seat seal position of the mainspring.

9. Appropriate centripetal displacement of the mainspring described in Claims 5 and 6 to the valve shaft side with an actuator or a manually rotated valve shaft so that the mainspring itself has a constant flow rate function. A relief spring valve characterized by the following.

10. The leaf spring valve according to claim 9, wherein an arbitrary constant flow rate is set according to the number of revolutions of the valve shaft.

11. The relief spring valve according to claims 1 to 10 is used for an air conditioner having a function of opening and closing, controlling, or controlling a constant flow rate of fluid in a pipe. Leaf spring valve.